Bernard Shaw - Sentry.

Cold is the night air, The shadows deep,

Dawn is far from sight.

Ghost's of sleep tempt my watch,

On this cold and wintry night.

Hear I not the sound of foe,

Stealthily creeping nigh.

If only the light of day would show,

My time of watch gone by.

Bernard Shaw

http://www.poemhunter.com/poem/sentry/